How do plants get energy?
Photosynthesis – process plants use to trap sun’s energy and build carbohydrates (glucose) that store energy.
Formula: 6CO 2 + 6H 2 O + energy → C 6 H 12 O 6 + 6O 2 6 carbon dioxide + 6 water + energy→ 1 glucose + 6 oxygen
2 Phases of Photosynthesis
2 Phases of Photosynthesis: 1. Light-dependent Reactions – Takes place in chloroplasts – Chloroplast contains pigment called chlorophyll which is green because it reflects green light. (In fall, trees absorb chlorophyll and other colors show through.) light energy (from Sun) → chemical energy (ATP)
2 Phases of Photosynthesis: 2. Light-independent Reactions or Calvin Cycle or Dark Reactions – Does not require light – Uses ATP (from light reactions) to convert CO 2 glucose to
How do plants regulate water & gas exchange?
Guard cells on the underside of leaves open to let in CO 2 and O 2 (waste product) and some H 2 O out (plant “sweating”). The cells are closed when they become flaccid & lose water. The cells open when they are full of water & swollen. This process is called transpiration.